diff --git a/respond/json.go b/respond/json.go
new file mode 100755
index 0000000..39ef24b
--- /dev/null
+++ b/respond/json.go
@@ -0,0 +1,25 @@
+package respond
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/Jille/convreq/internal"
+)
+
+type respondJSON struct {
+	data interface{}
+}
+
+// Respond implements convreq.HttpResponse.
+func (rj respondJSON) Respond(w http.ResponseWriter, r *http.Request) error {
+	if w.Header().Get("Content-Type") == "" {
+		w.Header().Set("Content-Type", "application/json")
+	}
+	return json.NewEncoder(w).Encode(rj.data)
+}
+
+// ServeJSON uses json.Marshal() to serve a JSON object.
+func ServeJSON(data interface{}) internal.HttpResponse {
+	return respondJSON{data}
+}